<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<div id="d1">
  <input type="text" v-model="num1">
  <input type="text" v-model="num2">
  <input type="button" value="加" @click="f(1)">
  <input type="button" value="减" @click="f(2)">
  <input type="button" value="乘" @click="f(3)">
  <input type="button" value="除" @click="f(4)">
  <h1>{{result}}</h1>
</div>
<script src="js/vue.min.js"></script>
<script>
  let v = new Vue({
    el:"#d1",
    data:{
      num1:"",
      num2:"",
      result:"结果："
    },
    methods:{
      f(x){
        console.log(123);
        if (isNaN(v.num1)||isNaN(v.num2)){
          v.result="输入错误";
          return;
        }
        switch (x) {
          case 1:
            v.result="结果："+(v.num1*1+v.num2*1);
            break;
          case 2:
            v.result="结果："+(v.num1-v.num2);
            break;
          case 3:
            v.result="结果："+(v.num1*v.num2);
            break;
          case 4:
            v.result="结果："+(v.num1/v.num2);
            break;
        }
        }
        }
  })
</script>
</body>
</html>